Could you give us an overview of what system you used for the front disc brake conversion and which master cylinder/reservoir etc? My car is very original and very low miles but total contact brakes are a pain and I have been toying with the idea of doing such a conversion as well, but for originality reasons I am on the fence. But safety matters too........ I still have the original total contact brakes on my 1957 300C and 1962 300H and they have been fine but the ones on the F have been more problematic and frustrating. I think it primarily is the availability of good parts for these systems. All my cars with such brakes have silicone fluid and if the parts do not deteriorate with that fluid, the systems seem to last forever. But when I replaced the brake parts on my F more recently and continued to use the same fluid, I think that is the source of the issue with the F. I talked with Jeff at Karp's Brake service who lives near by me and is one of the foremost old car brakes specialists anywhere, and he advised me to use parts that he sources from U.S. older nos and go back to using regular brake fluid and the issues will go away since silicone fluid seems to react with the materials in newer brake parts sourced from who knows where. Such an issue has been the case with the old brake fluid type brake switches on these old cars, which is why I have converted mine to a mechanical brake light switches. You have a stunning 300F! Mine is also white...................... Thanks!